LED Cubes .... decorative self made
http://www.instructables.com/ provides you with a whole lot of things you can do @your spare time and get fancy things done.
I found LED related articles very useful and handy like Cubes of various dimensions[http://www.instructables.com/id/3x3x3-LED-Cube/], globe [http://www.instructables.com/id/LED-GLOBE/]
